Rotary pump



March 10, 1936.

C; R. YIRAVA 1 ROTARY PUMP Fil'ed Oct. 3,. 1935 4 Sheets-Sheet l March 10, 1936. Q R, Y|RAVA 2,033,218

ROTARY PUMP Filed Oct. 3, 1933 4 Sheets-Sheet 2 March 10, 1936. c; R. YIRAVA 2,033,218

ROTARY PUMP Filed Oct. :5, 19ss- 4 Sheets- Sheet 3 2? 28' a; la

1 a I /fl/ 21 -22 2D C. R. YIRAVA March 10, 1936.

ROTARY PUMP Filed Oct. 5, 1953 {Sheets-Sheet 4 F'IE'IU Patented ROTARY PUMP Charles R. Yirava, Cleveland, Ohio Application October a, 1939, Serial No. 691,995 6 Claims. (01. 1os-1s) This invention relates to pumps, and its object is, generally, to provide a rotary pump improved in respects hereinafter appearing; and more particularly to provide such a pump having inner and outer compression and suction chambers arranged to function alternately with multiple pumping effect, thus increasing the capacity of the pump and insuring an even flow of fluid with minimum pressure and wear upon the main bearing and rotor shaft.

Other and more specific objects and advantages'of the invention will be apparent as the following specification is considered in connection with the accompanying drawings in which:

Figure 1 is a cross sectional view through the pump according to the invention showing the rotor and blades in elevation, the section bein taken on line ll of Fig. 5;

Figure 2 is a cross sectional view on line 2-2 of Figure 5; V

Figure 3 is a plan view of the housing showin the arcuate passages for the inner and outer chambers and the sealing members for sealing the arcuate passages against each other, when the rotor is placed in the housing;

Figure 4 is a cross sectional view through the bottom of the housing showing the communication of the intake and outlet sides of the pump with the inner and outer working chambers of the pump;

Figure 5 is a longitudinal sectional view through the pump, the section being taken on line 5-5 of Figure 1;

Figure 6 is a perspective view of the rotor;

Figure 7 is a perspective view of the blade guide and actuating member;

Figure 8 is a perspective view of one of the blades without the sealing strips;

Figure 9 is a fragmentary front elevation of a modified form of the pump according to the invention embodying a floating blade guide and actuating member, the floating action of which is adjustable;

Figure 10 is a longitudinal sectional view through the pump shown in Figure 9, the section being taken on line Ill-l0 of Figure 9; and

Figure 11 is a cross sectional view through the pump shown in Figures 9 and 10 showing the rotor and blades in elevation and the floating blade guide and actuating member in cross section, the section being taken on line I l-ll of Figure 10.

Referring more particularly to the drawings wherein like reference numerals denote corresponding parts throughout the several views, I

denotes the pump as a whole comprising a flanged body 2, a rotor 3 within the body portion and mounted eccentric to the axis of the latter. and a front plate or cover member 4 supporting a cylindrical blade guide and actuating member 5 5, within the rotor and eccentric to the axis thereof, but concentric to the axis of the body. This body is cored to form arcuate open outer fluid passages 5 and I on opposite sides of the pump communicating respectively with the oppow sitely disposed threaded inlet and outlet ports 8 and 9, through which the fluid is delivered to and expelled from the pump. Inner arcuate fluid passages 36 and 31 also formed by coring the body 2, are separated from the outer passages 15 6 and 1 by walls 38 and 39.

Rotor 3 is suitably connected to a shaft H) which extends through an eccentrically arranged bearing bore II) in the body I and is driven from any suitable source of power, such as an electric motor, not shown. The rotor is rotatably confined within a circular recess II in the body by means of cover plate 4, and normally closes the fluid passages 6 and 1 against communication with each other, any suitable means such as bolts 12 being employed to'securely fasten the cover plate to the peripheral flange l3 of the body. The axis of recess ll coincides with the axis of bearing bore Ill in the body 2 and consequently is eccentric to the axis of the body including the flange I3, thereof. The outer end of bore l0 through which shaft l0 extends is tightly sealed by means of a washer, M held in place by a coil spring l5 and plug member l6.

The rotor is formed with an outwardly extending flange l1 having a plurality of radially extending slots ID for slidably receiving and guiding blades l9, l9 and I9" therein. These blades are formed in their outer side and end edges with recesses or slots 20 adapted to snugly receive metal sealing strips 2| which seat upon coil springs 22 suitably retained in the bottom of the recesses. The outer ends of blades I! are held in constant engagement with the inner wall of body flange l3 by means of the cylindrical guide and actuating member 5 with which the inner ends of the blades have sliding contact. Member 5 is mounted upon a stud 23 secured to cover 4, and is stationarily supported within the conflnes of and in close working contact with the rotor flange IT. The inner flat end of member 6 is provided with radial grooves or slots 24 aligned with a groove 25 formed in the inner end of stud 23. A spring pressed metal sealing strip 26 seated in these intersecting grooves locks the member I against-rotation and forms a tight seal between the opposing flat faces of member I and the rotor. An additional groove 21 formed in the periphery of the member I, at right angles to and communicating with one of the grooves II, seats a spring pressed metal sealing strip II which contacts with the inner circular face of rotor flange II to effect a fluid seal between these two parts. If deemed desirable friction can be reduced by mounting the member I rotatably on stud I, however the fluid seal would be somewhat less tight with such a construction.

It will be seen that two suction and compression chambers II and II of crescent shape, are formed respectively between the periphery of rotor flange l1 and the inner face of body flange II and betweenthe innerface oftherotorflange and the periphery of the blade guide and actuating member I. The outer ends of blades II in cooperation with a spring pressed metal sealingstripIi seatedinagrooveII formedinthe body flange II', seal the suction side of the outer chamber II, from the compression side of the chamber, while the inner ends of blades II cooperate with the sealing strip II previously de-\ scribed, to seal the suction side of inner chamber II from the compression side thereof. Chambers 28 and II, which are ofl'set 180 degrees one from the other, are placed in communication with outer .arcuatefluid passages I-l, inner arcuate fluid es I'l-II and with each other in a manner about to be described. However it will be noted that the compression side of outer arcuate passage I is always in communication with the compression side of inner arcuate passage II at the point II around the lower bent end of wall II, and that the compression side of outer arcuate passage I has constant communication with the compression side of inner arcuate passage II at the point II around the pp r bent end of wall II.

The rotor is provided with fluid passages II, opening through the end wall II, of the rotor for communication with outer arcuate'passages I and 1, and extending outwardly nearly to the outer face of the rotor flange II. There are six of these ,es II, one on each side of blades II, II' and II", and each passage is adapted to intermittently communicate with the outer ores- .cent shaped suction and compression chamber II through openings II in the peripheral face of the flange i1 during normal operation of the pump. Inclined grooves II in the peripheral face of flange I! extend from opposite sides of the openings II, to the blade slots iI, for a continuous communication of the compression side and the suction side of outer chamber II with the arcuate as I and I. The crescent shaped inner suction and compression chamber II communicates with inner arcuate fluid passages II and I1, previously described, through openings Ii formed in the end wall II of the rotor adjacent each side of the inner end of blade slots II, as best illustrated in Figures 1 and 2 of the drawings. 1 A

Assuming the pump which is adapted for rotation in either direction to be on dead center position, with the blade II in contact with the sealing strip Ii, rotation of rotor I in an anticlockwise direction causes'this blade to be advanced to Figure 2 position, during which movement that passage II- following the blade II will be moved across inclined groove II and into communication with outer arcuate fluid pas- .sage I.

'I'luidissuckedfrom passage I, upthrough passage II and thence out through opening II into chamber II, in gradually increasing volume due to the presence of inclined groove II, until passage II clears the said groove II and registers directly with arcuate passage I, whereupon full communication between the intake I and chamber II is established. A very even flow is thus obtained and all danger of knocking and chattering is eliminated. As rotation of the rotor is continued blade iI is forced outwardly by the stationary guiding and actuating member I against the flange H of the body and the fluid is then carried around in chamber II, while additional fluid is being continuously sucked thereinto until passage II in advance of blades II" b carried beyond the far end of arcuate passage I and the groove II adjacent said far end. 0ontinued movement of the rotor from this point causes the fluid thus trapped between blades II and iI" to be compressed in the compression side of chamber II while the passage II following blade II is brought into alignment with the groove II at the lower end of arcuate passage I,

whereupon discharge is had through said groove II and passage 1 to and throughout outlet port I. while this action is occurring a supply of fluid is being sucked into that portion of chamber II between blades iI" and II in an obvious manner.

While the action just described a taking place fluid is being discharged from and sucked into inner crescent shaped chamber II through openings II adapted to be aitemately brought into communication with arcuate passages II and I1. Six openings Ii are provided in the endwall of the rotor, one in advance of and one following each blade slot II, and in radial alinemqit with but inwardly offset from passages II. The action which takes place in the inner crescent shaped compressing and suction chamber II is identical the pump over known rotor single cylinder pumps is also increased to an extentcorresponding to the area of chamber II.

The inner flat face of body I. is formed with inner and outer circular recesses II and II in which half circular spring pressed-metal sealing members II and I1 are respectively seated, and with radially disposed grooves II and II extending from the bore II' to opposite sides of chamber II for the reception of straight metal sealing strips II and II. Strip II is slightly ofl'set from or out of alinement with strip II to insure a full discharge or scavenging action on the discharge side of the pump.

The blades II are provided with recesses II communicating with the recesses II for sealing strip II, which recesses II have been found most desirable in actual .practice in that they permit liquid to freely enter and leave the space between the lower face of the sealing members and the bottom of the grooves during rotation of rotor.

In the modified form shown in Figures 9 through 11, the pump structure is identical in construction with the pump structure described dial plate 58, which latter is secured to cover plate 4' by means of screws 59. A packing 60 and washer 6| seal the opening 62 inplate 4' through which the stud shaft extends and a spring 83 seated at opposite ends against washer 8i and'the shoulder portion 64 of conical enlargement 54 compresses the packing and forces nut member 61 against dial plate 58.

In the arrangement Just described the guide, member 55, freely rotatably mounted on stud shaft 53, will have a limited floating action, when said shaft is adjusted to Figure 10 position by rotation of nut member 51. This floating action permits necessary adjustment of the output of the pump when pumping viscous liquids. This is important in many industries particularly in the manufacturing of rayon, where the proper amount of the viscous liquid fed to the perforated dies determines the strength and even thick- .nesses of the finished product.

Rotation of nut member 51 governs the output of the pump to the desired quantity because nut member 51 controls the seal between the guide member and rotor. Decrease in output caused by wear may be overcome by decreasing the floating action of the guide member.

Having thus described my invention,

what I claim is:

1.. A rotary pump comprising a body, having a chamber therein and intake and discharge passages, a circular recess in said chamber eccentrically arranged in the bottom thereof, a concentrically chambered'rotor mounted within said 1 recess and extending into said chamber for forming a crescent shaped working space in said body,

a cylindrical member eccentrically floating within said chambered rotor forming a crescent shaped working space in said rotor, spring pruse'd means for limiting the floating action of said member to predetermined" areas, shiftable means extending through the wall of said rotor into and through both said working spaces and revolvable with said rotor for subdividing these working spaces and floatingly supporting said cylindrical member in said chambered rotor, and

es within said recess and in communication with said intake and discharge passages adapted to be brought into communication with said crescent shaped working spaces.

2. A rotary pump. comprising a body, intake and discharge passages in said body, a crescent shaped working chamber within said body, a second crescent shaped working chamber enclosed by said first chamber and offset 180 degrees with respect thereto, longitudinalshiftable means extending into and subdividing said working chambers, said second shaped working chamber having its inner well formed by a freely rotatable floating circular member cooperating with and floatingly guided by said longitudinal shiftable means, and spring pressed means for limiting the floating action of said member to predetermined areas.

3. A rotary pump comprising a body having a chamber therein and intake and discharge passages, a circular recess in said chamber arranged in the bottom thereof, a rotor eccentrically mounted within said recess forming a crescent shaped working space in said body, a floatingly supported cylindrical member arranged within said rotor forming a. crescent shaped working space in said rotor, spring pressed means for limiting the floating action of said member to predetermined areas, shiftable means extending through the wall of said rotor into both said working spaces and revolvable with said rotor for subdividing the working spaces, and passages in communication with said intake and discharge passages adapted to be brought into communication with said crescent shaped working spaces, said cylindrical member being rotatably and floatingly supported by said shiftable means.

4. A rotary pump according to claim 3 in which the spring pressed means for limiting the floating action of the cylindrical 'member are adjustably supported by said body to adjustably limit the free floating action of said cylindrical member. I

5. A rotary pump comprising a body, intake and .discharge passages in said body, a crescent shaped working chamber within said body, a second crescent shaped working chamber enclosed by said first chamber and oilset 180 degrees with respect thereto, longitudinal shiftable means extending into and subdividing both said working chambers, said second chamber having its inner wall formed by a rotatable circular member embodying a conical bore axially extending therethrough and said member being floatingly guided by said longitudinal shiftable means and longitudinally adjustable conically shaped means extending through the bore of said circular member to limit the floating action of said member to predetermined proportions.

6. A rotary pump according to claim 5, wherein the longitudinally shiftable means extend outwardly through the wall of said body and means on the outside of said body'for shifting said shaft longitudinally of the desired position.

CHARLES R. YIRAVA. 

